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Add 21/28 and 30/63

21/28 + 30/63 is 103/84.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 63 is 252

    Next, find the equivalent fraction of both fractional numbers with denominator 252
  2. For the 1st fraction, since 28 × 9 = 252,
    21/28 = 21 × 9/28 × 9 = 189/252
  3. Likewise, for the 2nd fraction, since 63 × 4 = 252,
    30/63 = 30 × 4/63 × 4 = 120/252
  4. Add the two like fractions:
    189/252 + 120/252 = 189 + 120/252 = 309/252
  5. 309/252 simplified gives 103/84
  6. So, 21/28 + 30/63 = 103/84
    In mixed form: 119/84

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